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A NEW RECORD of COELASTRELLA TERRESTRIS (REISIGL) HEGEWALD & N. HANAGATA, 2002 (SPHAEROPLEALES, SCENEDESMACEAE) in IRAQ Alta

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A NEW RECORD of COELASTRELLA TERRESTRIS (REISIGL) HEGEWALD & N. HANAGATA, 2002 (SPHAEROPLEALES, SCENEDESMACEAE) in IRAQ Alta Altaf Al-Rawi et al. Bull. Iraq nat. Hist. Mus. http://dx.doi.org/10.26842/binhm.7.2018.15.2.0153 December, (2018) 15 (2): 153-161 A NEW RECORD OF COELASTRELLA TERRESTRIS (REISIGL) HEGEWALD & N. HANAGATA, 2002 (SPHAEROPLEALES, SCENEDESMACEAE) IN IRAQ Altaf Al-Rawi Bushra M. J. Alwash Nagham E. Al-Essa and Fikrat M. Hassan* Department of Biology, College of Science for Women, University of Baghdad, Baghdad, Iraq *Corresponding Author: [email protected] Received Date: 1 June 2018 Accepted Date: 6 August 2018 ABSTRACT This study identified the genus Coelastrella Chodat, 1922 which was isolated from a sediment sample taken from the Tigris river in Baghdad Governorate, Iraq. The alga was isolated and cultured in modified Chu 10 media and the morphological features of the isolated algae were observed in light microscopy (LM); it showed some characteristic features of this genus, such as its ellipsoidal or lemon- shaped cells, a visible pyrenoid and the chloroplast parietal. To ensure correct identification of the isolated alga, a molecular analysis using 18S rRNA gene and DNA sequencing revealed a match with C. terrestris (Reisigl) Hedewald & N. Hanagata 2002. This species is a new record in Iraq, and has been registered in NCBI under the accession number MH179121. Keywords: Coelastrella terrestris, Iraq, MH179121, NCBI, Scenedesmaceae. INTRODUCTION The classification of algae based on morphological and ultrastructural approaches has been performed for a long time (Prescott, 1973, Graham and Wilcox, 2000, Wehr and Sheath, 2003) while molecular approach is using the sequences of small and large subunits of ribosomal RNA genes. Therefore, most of coccoid green algae such as Chlorella (Beyerinck) have been revised and most of these alga changed into a new genus such as the Chlorella fusca var. vacuolata which is basionym of Coelastrella vacuolata (Hegewald and Hanagata, 2002). Chodat first described Coelastrella in 1922(Chodat, 1922); Uzunov et al. (2008) explained the historical classification of C. terrestris according to its morphology under a light microscope and scanning electron microscopy. Tschaikner et al. (2008) mentioned that the genera Scotiellopsis Vinatzer or Graesiella Kalina et Punčoch were registered as Coelastrella according to the study of Hegewald and Hanagata (2000, 2002). The basionym of C. terrestris is Scotiellaterrestris Reisigl, and this algae is within the subfamily Scendesmodeae (Hegewalid and Hanagata, 2002); many studies isolated the C. terrestrial from the surface of the rock (Aburai et al., 2013) or from soil in Bulgaria (Uzunov et al., 2008) and some other Coelastrella spp. was isolated from alpine in Austria (Tschaikner et al., 2007 and 2008). This genus has a distinctive cell wall with ribs, its cell form, 153 A new record of Coelastrella terrestris chloroplast and pyrenoid (Tschaikner et al., 2007); Uzunov et al. (2008) revealed the difficulty to observe the ribs by light microscope examination, but they can be visible (ribs are about 8-14 in number) when using a scanning electron microscope (SEM); many authors revealed the importance of Coelastrella spp., because they contain antioxidants and other commercial compounds (Vilchez et al., 2011; Aburai et al., 2013). The C. terrestrial belongs to Coelastroideae (subfamily), Scenedsmaceae (family), Sphaeropleales (order) and Chlorophyceae (class) (Guiry, 2018). Many authors in Iraq investigated aquatic algae, including phytoplankton, benthic algae and macroalgae (Maulood et al., 2013); A few of them studied soil algae collected from the rice-fields in Iraq (Al-Kaisi, 1976; Al Mousawi and Whitton, 1983), but there are few studies up to date on terrestrial algae. Maulood et al. (2013) listed 788 taxa of Chlorophyceae in Iraq, but without mentioning the genus Coelastrella Chodat; only one recent study reported Coelastrella as isolated from Tigris river by using 18S rRNA, but the study did not classify its species (Abed et al., 2018). This study aimed to confirm the identification of the species of Coelastrella by using molecular analysis and it is an attempt to revise the classification of Iraqi algal flora by this technique. MATERIALS AND METHODS The algae sampling and culture condition: The algae was collected from sediments on the bank of the Tigris river during autumn 2017; the sediment sample was collected at a depth of 2-3 cm with an area of 50 m2 below the sediment surface by spatula and kept in a nylon sac with some river water (Hassan et al., 2017). A liquid solution was prepared from the sediment sample by mixing 1 part of sediment with 2 parts of distilled water. The alga was inoculated into modified Chu-10 nutrient solution (Tab. 1), following the steps described by Hassan et al. (2013). These cultures were incubated in a cooled illuminated incubator with 30 ±3˚C, 300µE/m2/s and 16:8 light: dark for 20 days in the Advance Algal Laboratory of the Department of Biology, College of Science for Women at the University of Baghdad. Microscopic examination was done by Genex compound microscope model GX- 140105. 154 Altaf Al-Rawi et al. Table (1): Modified Chu 10 medium composition (followed Hassan et al., 2013) Number of stock Chemical formula of each Concentration g/l solution salt 1 MgSO4 10 2 K2HPO4 4 3 NaNO3 8 CaCl2 16 4 Fe Cl3 0.32 5 EDTA-Na2 4 6 NaCl 30 7 Na2CO3 8 8 MnCl2.4H2O 0.02 (NH4) 6Mo7O24.4H2O 0.028 ZnSO4.7H2O 0.224 CuSO4.5H2O 0.08 COCl2.6H2O 0.0004 H3BO3 0.288 9 Na2 SiO3 5.7 Identification of samples using molecular method: Primer selection : The isolated microalgae was identified by the amplification of conserved 18S rRNA encoding gene using ITS1 and ITS4 universal primers (Vorobyev et al., 2009). A forward primer (5′-TCCGTAGGTGAACCTGCGG-3′) and a reverse primer (5′ TCCTCCGCTTATTGATATGC-3′) were used; primers set supplied by IDT (Integrated DNA Technologies company, Canada). Genomic DNA extraction: The genomic DNA of algae was extracted by using a fast DNA Intron kit (G-spin Total DNA Extraction) and the isolated DNA was subjected to PCR (Gene Amp, PCR system 9700; Applied Biosystem) according to manufacturer's instructions. The PCR products were separated by 1% agrose gel electrophoresis and visualized by ultraviolet light (302 nm). Polymerase chain reaction (PCR) The PCR amplification reaction was performed in a total volume of 25µl containing 2ng/µl DNA, (1 X) Taq PCR PreMix (Intron, Korea), and 1µM of each primer, and then distilled water was added into tubes. The thermal cycling conditions were performed as follows: Denaturation at 94 °C for 3 min, followed by 35 cycles of 94°C for 45s, 52°C for 1 min and 72°C for 1min with final incubation at 72°C for 7 min using a thermal Cycler (Gene Amp, PCR system 9700; Applied Biosystem). The PCR products were separated by 2% agarose gel electrophoresis and visualized by exposure to ultraviolet light (302nm) after red stain staining (Intron Korea). 155 A new record of Coelastrella terrestris Sequencing and data analysis Sequencing of 18S rRNA gene was performed by the national instrumentation center for environmental management (nicem) online at: http://nicem.snu.ac.kr/main/?en_skin=index.html, using a DNA sequencer 3730XL by Applied Biosystem. A homology search was conducted using Basic Local Alignment Search Tool (BLAST) program which is available at the National Center Biotechnology Information (NCBI) online at (http://www.ncbi.nlm.nih.gov) and the BioEdit program. An expected value is defined to give an estimate of the number of times expected to get the same similarity coincidental and the lower the value of E. This indicates that the degree of similarity was high between sequences which give greater confidence; a value close to zero means that these sequences are identical and the Bit Score, which is a statistical measure of the sequence similarity and the higher value indicates a high degree of similarity. The phylogenetic tree of aligned sequences was conducted using MEGA 6 program. RESULTS AND DISCUSSION The examination of the isolated green algae under the compound microscope appeared as ellipsoidal or lemon-shaped cells; it is a broad ranged, with a width of 7.2 µm to 8.4 µm and length 9.8 µm to 10.8 µm. Other morphological features observed a visible pyrenoid and the chloroplast parietal, but the ribs on the cell were not seen in this investigation. Also, the autospores of the algae was observed and appeared as clusters of two or four (Pl. 1); many authors showed that the ribs of this species were hardly visible under the light microscope, but appeared clearly by using SEM (Uzunov et al., 2008). Prescott (1973) reported that Chlorella was confused with other soil algae or subaerial genus due to its cell ellipsoid (7-8µ in diameter and 9.5µ) and produce 4-8 autospores. Therefore, it is important to use the molecular analysis for the algal classification to raise the ambiguity of the classification according to the observed morphology. Many related genera of the coccid algae has been rearranged according to the use of molecular concept which included the C. terrestris (Hanagata, 1998; Hegewald and Hanagata, 2002). In this study, the LM and molecular approach used to identify the C. terrestris. Plate(1): C. terrestris; (A) Vegetative cells, (B) Autospors (2-4 spores). (Scale bars= 10µm) Identification of the microalga C. terrestris was confirmed by sequence-based phylogenetic analysis using 18S ribosomal RNA gene sequencing; the PCR products obtained were subsequently sequenced to obtain DNA sequences, and a 650 base pair product was obtained (Pl. 2). The amplicon was aligned using BLAST at NCBI, the 18S rRNA sequence of isolated 156 Altaf Al-Rawi et al. alga showed 95% homology with the existing NCBI database sequence of C. terrestris with accession number JX5513888.1.
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